昨日の再帰FizzBuzzをマルチスレッドで実行する奴。 fizzbuzzOrderで求めたいfizzbuzzの最後の値を指定し、bitSizeで1スレッドでの計算数を指定できる。

parallelFizzbuzz.d

import std.conv,
       std.stdio,
       std.range,
       std.algorithm;
import core.thread;

string[] fizzbuzz(int max, int i = 0, string[] base = null){
  return max == 0 ? base : fizzbuzz(max - 1, ++i, base ~ {
      return !(i % 15)    ? "FizzBuzz" :
               !(i % 3)   ? "Fizz"     :
                 !(i % 5) ? "Buzz"     : i.to!string;
      }());
}
void main(){
  immutable fizzbuzzOrder = 30000;
  immutable bitSize       = 50;
  immutable threadMax     = fizzbuzzOrder / bitSize;
  string[fizzbuzzOrder] threadVals;
  int threadCount;

  foreach(i; 0..(fizzbuzzOrder / bitSize))
    new Thread((){
        threadVals[(bitSize * i)..(bitSize * (i + 1))] = fizzbuzz(bitSize, bitSize * i);
        threadCount++;//Add finished thread
      }).start;

  while(threadCount < (fizzbuzzOrder / bitSize)){}//Wait

  foreach(e; threadVals)
    e.writeln;

  writeln("len:", threadVals.length);
}